1

A

2

B

3

C

interval betwen 3 et 4

30 / frequency

4

director 4

138 / frequency

D

interval betwen 4 et 5

30 / frequency

5

Dipôle

143 / frequency

E

interval betwen 5 et 6

48 / frequency

6

reflector

150 / frequency

BUILD THE DIPOLE

the dipole is an essential element of the YAGI antenna.
He receive the wave. the impédance ( résistance in function
of the frequency ) is one parameter very important. for the most popular
FM TUNER receive the impédance is 75 ohms. For respect this condition,
the dimension of the dipole is accurate. In this exemple is constituted of
too pipe of different diameter. The first pipe N°1 diamter 15 mm and
the N°2 is 10mm. Joint the pipe at the extremity .